<?php

class base_kvstore_memcache extends base_kvstore_abstract implements base_interface_kvstore_base {

    private static $_cacheObj;

    function __construct($prefix) {
        $this->connect();
        $this->prefix = $prefix;
    }
 // End Function
    public function connect() {
        if (! isset(self::$_cacheObj)) {
            if (defined('KVSTORE_MEMCACHE_CONFIG') && constant('KVSTORE_MEMCACHE_CONFIG')) {
                self::$_cacheObj = new Memcache();
                $config = explode(',', KVSTORE_MEMCACHE_CONFIG);
                foreach ($config as $row) {
                    $row = trim($row);
                    if (strpos($row, 'unix:///') === 0) {
                        self::$_cacheObj->addServer($row, 0);
                    } else {
                        $tmp = explode(':', $row);
                        self::$_cacheObj->addServer($tmp[0], $tmp[1]);
                    }
                }
            } else {
                trigger_error('can\'t load KVSTORE_MEMCACHE_CONFIG, please check it', E_USER_ERROR);
            }
        }
    }
 // End Function
    public function fetch($key, &$value, $timeout_version = null) {
        $store = self::$_cacheObj->get($this->create_key($key));
        if ($store !== false) {
            if ($timeout_version < $store['dateline']) {
                if ($store['ttl'] > 0 && ($store['dateline'] + $store['ttl']) < time()) {
                    return false;
                }
                $value = $store['value'];
                return true;
            }
        }
        return false;
    }
 // End Function
    public function store($key, $value, $ttl = 0) {
        $store['value'] = $value;
        $store['dateline'] = time();
        $store['ttl'] = $ttl;
        return self::$_cacheObj->set($this->create_key($key), $store, MEMCACHE_COMPRESSED, 0);
    }
 // End Function
    public function delete($key) {
        return self::$_cacheObj->delete($this->create_key($key));
    }
 // End Function
    public function recovery($record) {
        $key = $record['key'];
        $store['value'] = $record['value'];
        $store['dateline'] = $record['dateline'];
        $store['ttl'] = $record['ttl'];
        return self::$_cacheObj->set($this->create_key($key), $store, MEMCACHE_COMPRESSED, 0);
    } // End Function
}//End Class